Researchers ran a sophisticated low-temperature asphalt cracking performance test at multiple labs to study the test, its variability and repeatability, and its additional promise in studying reflective cracking susceptibility of overlays. Results put MnDOT closer to implementing test specifications for low-temperature cracking test for pavement mixes.
Continue reading Low-Temperature Cracking Test Produces Repeatable, Reliable ResultsCategory Archives: Research
General research posts.
Investigating Wastewater Reuse at Rest Areas and Truck Stations
Researchers have provided MnDOT with a comprehensive and practical evaluation of what the agency would need to do to develop wastewater reuse systems for its truck stations and rest areas. Two sites will install the research project’s recommended systems soon.
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Smartphone App Alerts Drivers Exceeding Speed Limits on Curves
Researchers have developed a proof-of-concept curve speed warning system for use with mobile phones, a technology they hope car manufacturers might adopt for in-vehicle systems. The proof-of-concept system uses data from local road agencies on curve locations, speed limits and signage with geofencing to trigger cloud-based data alerts to road users driving faster than recommended speeds for curves.
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Using Regional Materials to Manage Stormwater Runoff
Researchers determined that natural soil amended with locally sourced materials performed well in bioslopes and bioswales. This practice will allow MnDOT to avoid hauling in costly commercial materials for stormwater management installations.
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Evaluating Iron-Enhanced Swale Ditch Checks for Phosphorus Removal
Researchers documented performance of an iron-enhanced ditch check filter to remove phosphorus from stormwater over three years. The filter was effective, but its performance decreased over time, and it will require relatively frequent maintenance. Several design changes may be considered.
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New Project: GIS Tools and Apps – Integration with Asset Management
The Minnesota Local Road Research Board recently funded a project to survey and analyze the use of Geographic Information System (GIS)-based asset management tools for city and county public works departments.
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New Project: Use of Innovative Technology to temporarily Deter Bat-Bridge Use Prior to and During Construction
MnDOT has funded a study to evaluate the use of non-lethal ultrasonic acoustic devices to temporarily deter bats from bridges before and during construction projects.
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Leveraging Existing Inductive Loops to Classify Highway Vehicles
Researchers evaluated the use of existing inductive loop installations in Minnesota for vehicle classification. Results showed that inductive loops may be effective at identifying and classifying individual vehicles as they pass, but the system will require further refining for Minnesota use.
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Roadside Turf That Tolerates Salt, Heat and Ice
A recently completed research study has identified turfgrass species and cultivars that perform best under the heat and salt on Minnesota roadsides.
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Recycling Asphalt Pavement Offers Strong Alternative to New Aggregate Base
In a newly completed study, researchers found that stabilized full-depth reclamation has produced stronger roads for commercial loads in Minnesota, and the method shows promise for uses in rural agricultural areas. How much greater the strength gained with each stabilizing agent is better understood, though not conclusively.
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